Black Oxide-Coated Pin Gauge Set Material Tool Steel Finish Black Oxide Diameter Increment 0.02 mm Diameter Range 0.20 to 1.28 mm Gauge Type Go (Plus) Number of Gauges 55 Overall Length 2 in Surface Finish Uncoated Tolerance 0.0002 in Tolerance Class ZZ Hardness RC 60/65 Included Certification Certificate of Accuracy Long Form Calibration Certificate No Standards ISO 17025 2005 Dimension Type Metric